Perhaps you should try some spelling variations:
ve triet » va trien, su triet
va triet » va thiet, va trien, cua triet
van hanh » van thanh, ban hanh, van anh
phan duc » pham duc, phan tu, phan dau
sang tay » sang tao, sang tac, bang tay
sang tai » hang tai, sang tao, tang tai
va phan » van phan, va phat, va phap
duc van » duc va, duc tan, duc manh
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach _ ((sang tay) OR (sang tai)) hoi. lieu va phan duc van hanh di ((va triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach _ ((sang tay) or (sang tai)) hoi. lieu va phan duc van hanh di ((va triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach _ ((sang tay) or (sang tai)) hoi. lieu va phan duc van hanh di ((va triet) OR (ve triet))*.